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首页> 外文会议>Symposium on Microcrystalline and Nanocrystalline Semiconductors-1998 held November 30-December 3, 1998, Boston, Massachusetts, U.S.A. >In situ diagnostics of nanomaterial synthesis by laser ablation: time-resolved photoluminescence spectra and imaging of gas-suspended nanoparticles deposited for thin films
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In situ diagnostics of nanomaterial synthesis by laser ablation: time-resolved photoluminescence spectra and imaging of gas-suspended nanoparticles deposited for thin films

机译：激光烧蚀对纳米材料合成的原位诊断：时间分辨的光致发光光谱和沉积在薄膜上的气体悬浮纳米颗粒的成像

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摘要

The dynamics of nanoparticle formation by laser ablation into background gases are revealed by gated-ICCD photography of photoluminescence (PL) and Rayleigh-scattering (RS) from gas-suspended nanoparticles. These techniques, along with gated-spectroscopy of PL from isolated, gassuspended nanoparticles, permit fundamental investigations of nanomaterial growth, doping, and luminescence properties prior to deposition for thin films. Using the time-resolved diagnostics, particles unambiguously formed in the gas phase were collected on TEM grids. Silicon nanoparticles, 1-10 nm in diameter, were deposited following laser ablation into 1-10 Torr Ar or He. Three in situ PL bands (1.8, 2.6, 3.2 eV) similar to oxidized porous silicon were measured, but with a pronounced vibronic structure. Structureless photoluminescence bands were reproduced in the films (2.1, 2.7, 3.2 eV) only after standared annealing. The ablation of metal zinc into Ar/O_2 is also reported for the preparation of < 10 nm diameter hexagonal zincite nanocrystals, The particles were analyzed by bright field and Z-contrast TEM and high resolution EELS.
机译：激光烧蚀成背景气体形成纳米粒子的动力学是通过气体悬浮纳米粒子的光致发光（PL）和瑞利散射（RS）的门控ICCD摄影揭示的。这些技术，以及隔离的，悬浮于气体中的纳米颗粒的PL的门控光谱技术，可以在沉积薄膜之前对纳米材料的生长，掺杂和发光特性进行基础研究。使用时间分辨诊断程序，可以在TEM栅格上收集气相中明确形成的颗粒。激光烧蚀后，将直径为1-10 nm的硅纳米颗粒沉积到1-10 Torr Ar或He中。测量了三个类似于氧化多孔硅的原位PL带（1.8、2.6、3.2 eV），但具有明显的振动结构。仅在经过标准退火后，薄膜（2.1、2.7、3.2 eV）中才会复制出无结构的光致发光带。还报道了将金属锌烧蚀成Ar / O_2制备直径小于10 nm的六角形亚锌酸盐纳米晶体的方法。通过明场和Z对比TEM和高分辨率EELS分析了这些颗粒。

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